Projects

“Makeevka metallurgical works” CJSC, Makeevka, Ukraine (2007)

RECONSTRUCTION PROJECT OF THE АТ-25-2 TURBOGENERATOR

     Reconstruction project of the turbo-installation АТ-25-2 st.№1 is executed at a central electric blowing house of «Makeevka metallurgical works». The following technological systems were reconstructed:

        the main steam lines system;

        extracted steam pipelines;

        the basic condensate system;

        the circulating system;

        system of steam supply for turbine packing;

        the oil system;

        turbine control system;

        drainage system.

Reconstruction includes:

        replacement of condensate lines, circulating pipelines, drainage pipelines, ejectors, replacement and installation of the condensate pumps, circulating pumps, oil pumps, variable valves and isolation valves, elements of regulation system;

        a corrosion-resistant coating of condenser water chambers, oil coolers, air coolers.

     Our company executed a completion of documentation for turbine air-gas channel elements according to requirements of the operating normative documentation.

     The design documentation was developed taking into account requirements of Operational regulations for power stations and networks, Rules for the Construction and Safe Operation of Steam and Hot Water Pipelines, and also the gained experience of the similar units reconstruction in metallurgy industry of Ukraine.

     Pipelines strength calculations were carried out taking into account all load factors (pressure, weight, temperature expansions, etc.). The complete set of the working documentation allows:

        manufacturing of the turbine and pipelines elements;

        executing of the repair-and-renewal operations by an assembly organization;

        executing of the commissioning and balancing works by adjusters;

        ensuring of the power unit normal operation.

     Having developed design documentation we kept the existing flow diagram of power unit, but laid new modern components, equipment and elements made by manufacturers at the present time. Automatic control system is improved. It provides the following functions:

        regulating units control during unit start-up, operating mode change or its stop;

        maintenance of the unit long operation;

        maintenance of the set rotation frequency with demanded degree of irregularity.

     The developed system of the feed water regenerative heating is kept. It essentially influences technical and economic indices of the unit.

     The basic technical characteristics of the turbine (type АТ-25-2)

Characteristic

Value

1.

Nominal capacity

25MW

2.

Rotary rotations per minute

3000

3.

Working steam parameters: pressure

temperature

28kgs/cm2

4000С